This article[1] is a good read answering @OP's title on how cryptocurrencies affect global economy.
The article answered how will global investments be impacted. It stated that it hedges the portfolio from potential risks the main reason for the rise of cryptocurrencies across various exchange-traded products.
It also stated the benefits of the global economy on cryptocurrency since it speeds up transactions, having no intermediaries results in lower fees, less need for a physical structure that gives lower fixed cost due to no need for wages, rent expenses, and utility bills. There is no global barriers since cryptocurrency has no boundaries and it facilitates easy and quick trade for corporations (reason why SBF can easily comingle FTX funds with Alameda)
In addition, it also stated that entreprenuers can receive payment in more currency which helps them get financial coverage and liberated financial connection. Since the cryptocurrency network is backed by distributed ledger technology. It is automated and digitized too. Thus, it eliminates the risk of fraud and corruption, the biggest dent in the traditional financial system.[1]
Cryptocurrency also enable financial inclusions[1] and blockchain and cryptocurrency can help build greener future.[1]
[1]
https://internationalfinance.com/how-cryptocurrency-reshape-global-economy/